girparser: Fix criticals when encountering async creation methods
girparser: Fix criticals when encountering async creation methods

severinh/vala,spidermonkdust/vala,spidermonkdust/vala,flobrosch/vala-fixes,Distrotech/vala,playya/vala,GNOME/vala,GNOME/vala,Distrotech/vala,jessevdk/vala,rvu95/vala,xdave/pvala,GNOME/vala,jessevdk/vala,frida/vala,spidermonkdust/vala,rvu95/vala,rvu95/vala,playya/vala,playya/vala,Distrotech/vala,frida/vala,severinh/vala,severinh/vala,flobrosch/vala-fixes,GNOME/vala,frida/vala,flobrosch/vala-fixes,jessevdk/vala,frida/vala,frida/vala